Most of those tribes are "lesser" tribes cast outside the walls of the empire and considered a nuisance to both the larger tribes and other races. Amani, Farraki, Gurubashi, and Zandalari tribes are all strong, despite the events of the Cataclysm and Vol'jins efforts. Drakkari Ice trolls are not gone. The magazine and Brann are full of crap when there are dozens and dozens of Drakkari Ice trolls in the Zandalari invasion force casting their annoying frostbolts. Either this was oversight on Blizzards part or intentionally done to show Brann's fallibility, either way if they were extinct they wouldn't be the most annoying mobs in the Zandalari invasion force.

---------- Post added 2012-10-31 at 08:00 AM ----------

Originally Posted by Duito

They will rise don't worry, the time of a new troll empire...a master tribe as some may say, is rising!

rofl the "troll master tribe" is the Kal'dorei, they are also on their way out.

I wouldn't say they're destroyed, but greatly weakened when they united with the Amani and Gurubashi, who we wiped out (maybe completely). The leaders of Zandalari is still around AFAIK (could be wrong, havn't read a lot of troll lore recently)

I believe the Zandalari have taken in a few trolls from different tribes, having both Amani and Gurubashi sided with them with the troll dungeons of 4.1

depends on how big a land mass the Zandalari have, we could see a few troll tribes still in existence

however the zul'drak ice trolls are gone, too bad, their loa's were cool

I did the troll-quests up in Kun-Lai summit, and i saw trolls from pretty much all tribes there (Drakkari, Farraki, Amani, Gurubashi), so the Zandalari seem to have united (part of) all troll tribes, maybe this means we can finally wipe all those insipid tribes out in one fell swoop, i'm so bloody tired of trolls by now...

And the way you liberally use "wiped-out" is saddening. The Gurubashi, Amani, Farraki, Drakkari are all doing fine. It really depends on if these tribes have some stake on Zandalar. This is very similar to how many tribes of Orcs have stake in Orgrimmar, and Tauren tribes have stake in Thunderbluff.